how to get instanceName by String

In Objective-C how to get instance name by certain rules?

For example:

Type1: self.btn(0,1,2,3,4,5,6,7,8,9...) in for loop get number from i

for(int i = 0; i<10; i++){
//wrong code ( similar ActionScript3.0 code)
self."btn"+i = [UIButton buttonWithType:UIButonTypeRoundRect];
//i think code but, not available
self.[NSString stringWithFormat:@"btn%d", i] = [UIButton buttonWithType:UIButtonTypeRoundedRect];
}

Type2: UIButton *btn(0,1,2,3,4,5,6,7,8,9...) in for loop get number from i

for(int i =0; i<10; i++){
//wrong code ( similar ActionScript3.0 code)
UIButton *"btn"+i = [UIButton buttonWithType:UIButtonTypeRoundRect];
//i think code but, not available
UIButton *[NSString stringWithFormat:@"btn%d", i] = [UIButton buttonWithType:UIButtonTypeRoundedRect];
}

So, In ActionScript3.0 Soruce is below.

for( var i=0; i<10; i++){
this["btn"+i] = new SimpeButton();
//btn0, btn1, btn2...btn1开发者_开发问答0 get by for loop i object Simpebutton ten.
}

In objective c there is no instance name for buttons. There is a tag property, where you can store integer value so you can recognize proper button. You can create buttons in a loop, set a proper tag property and store in an array:

NSMutableArray *buttonsArray = [[NSMutableArray alloc] init];
for( var i=0; i<10; i++) {
     UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundRect];
     button.tag = i;
     [buttonsArray addObject:button];
}

and then you can loop this array in one way:

for (UIButton *aButton in buttonsArray) {
     // do something with aButton instance
}

or another:

for (int i=0; i<[buttonsArray count]; i++) {
     // do something with [buttonsArray objectAtIndex:i];
}

That precise idiom doesn't exist in Objective-C. The equivalent is to use an NSArray (or, for cases where the identifiers aren't sequentially numbered, an NSDictionary).